Httprequest?

[Daemoncraft]

namespace getsource
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void btnget_Click(object sender, EventArgs e)
        {
            StringBuilder sb = new StringBuilder();
            HttpWebRequest request = (HttpWebRequest)
            WebRequest.Create("http://www.cohackers.com");
            HttpWebResponse response = (HttpWebResponse)
            request.GetResponse();
            Stream resStream = response.GetResponseStream();
            source.Text = "" +sb.ToString();
        }

        private void btnclose_Click(object sender, EventArgs e)
        {
            Close();
        }
    }
}

I cant get it to insert to source.Text(richTextBox)